#include <TimerOne.h>
#include "synth.h"
#include "voice.h"
#include "tests.h"

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Data Structures
class	ThreadSafeSynth

class	FunctionKey

Macros
#define	KEYBOARD 1

#define	NUM_KEYS 11

#define	NUM_NOISY_VOICES 4

#define	NUM_SIMPLE_VOICES 14

#define	NUM_SQUARE_VOICES 8

Functions
void	timer_interrupt (void)

uint8_t	read_key (uint32_t id)

void	setup ()

void	loop (void)

Variables
Key *	keyboard [NUM_KEYS]

ThreadSafeSynth	s

ThreadSafeSynth	s2

ThreadSafeSynth	s3

ISynth *	synth_ary [3]

int8_t	pitches [] = { 0, 2, 4, 5, 7, 9, 11, 12 }

uint32_t	tune []

uint32_t	start_time

uint32_t	tune_pointer

Macro Definition Documentation

#define KEYBOARD 1

Definition at line 7 of file teensy.ino.

#define NUM_KEYS 11

Definition at line 8 of file teensy.ino.

Referenced by loop(), and setup().

#define NUM_NOISY_VOICES 4

Referenced by setup().

#define NUM_SIMPLE_VOICES 14

Referenced by setup().

#define NUM_SQUARE_VOICES 8

Referenced by setup().

Function Documentation

void loop ( void )

Arduino loop function

Definition at line 164 of file teensy.ino.

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uint8_t read_key ( uint32_t id )

Keyboard scanning passes thru this function because all Teensy-specific code lives in this file. If you're thinking about touch-sensitive keys or other exotica, this is the place for that. Also, if keys are assigned special functions, that should be handled here.

Definition at line 91 of file teensy.ino.

void setup ( )

Note that there are different numbers of voices assigned for the different types of voice. The more complicated a voice is, the less polyphony is possible. There are two ways to address this.

Lower the sampling rate, which adversely impacts sound quality.
Speed up the code. That means doing a lot of profiling (best done with a GPIO pin and an oscilloscope in this situation) and then write tighter C++ code and possibly some assembly language.

Definition at line 106 of file teensy.ino.

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void timer_interrupt ( void )

The timer interrupt takes audio samples from the queue and feeds them to the 12-bit DAC. If there is a queue underrun, it turns on the LED briefly but visibly.

Definition at line 68 of file teensy.ino.

Referenced by setup().

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